JPH09174220A - Die casting machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the reliability of a die casting machine by surely extruding a solidified cast material of molten metal from a die at the time of opening the die. SOLUTION: This die casting machine 10 is constituted so as to execute the die-opening in a holding condition of the solidified cast material R of the molten metal in passages 16m, 14r, 14j communicated with a cavity 13 to a fixed die 16 and eject the cast material R from the fixed die 16 by further pressing with a plunger chip 18. In this case, in the fixed die 16, a holding die 20 for holding the cast material R and ejecting mechanisms 24, 30, 26 for shifting this holding die 20 to a position coming off from the cast material R and further, ejecting the cast material R from the fixed die 16 which almost synchronizing with the plunger chip 18. Therefore, large ejecting force concentrically loaded to a part of the cast material R is not applied and the breakage of the cast material R can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention opens a mold in a state where a molten material solidified in a passage communicating with a cavity is held in a fixed mold, and the molten material is pressed by a plunger tip. The present invention relates to a die casting machine that extrudes from a fixed die.

[0002]

2. Description of the Related Art The main part of a die casting machine related to this is shown in FIG. This die casting machine 1 has a main movable type 2
And an intermediate movable mold 4 and a fixed mold 6, and the main movable mold 2
In the state where the mold is clamped with respect to the intermediate movable mold 4, a cavity 3 which is a product molding portion is formed inside. Further, a main runner 6m, a runner 4r, and a gate 4j which are passages for supplying molten metal to the cavity 3 are formed inside the intermediate movable die 4 in a state where the die is clamped with respect to the fixed die 6. The main runner 6m is formed vertically on the surface of the fixed die 6, and the upper end portion thereof has a reverse slope K that widens the inside so as to hold a molten material (hereinafter, referred to as a rough material R) when the die is opened. Is provided. Further, a sprue bush 6b for guiding the plunger tip 8 is provided in the lower part of the fixed die 6, and the sprue bush 6b is provided.
The lower end of the main runner 6m is connected to b.

When the main movable die 2, the intermediate movable die 4 and the fixed die 6 are clamped, the plunger tip 8 operates and the molten metal passes through the sprue bush 6b, the main runner 6m, the runner 4r and the gate 4j. Then, it is pressed into the cavity 3. Then, when the molten metal is solidified after a lapse of a predetermined time, the main movable mold 2 and the intermediate movable mold 4 are separated from the fixed mold 6 in the clamped state as shown in FIG. The fixed mold 6 and the intermediate movable mold 4 are opened. As a result, the coarse material R solidified in the main runner 6m, the runner 4r, and the gate 4j is cut from the product W at the thin gate 4j, and is held in a state of sticking to the main runner 6m of the fixed mold 6. Next, as the plunger tip 8 advances, the rough material R attached to the fixed die 6 is pushed out from the fixed die 6. The product W is extruded by a push pin (not shown) with the main movable die 2 and the intermediate movable die 4 opened.

[0004]

However, according to the die casting machine 1 described above, since only the lower end portion of the rough material R is extruded by the plunger tip 8, the rough material R is concentrated on a part thereof and a large pushing force is exerted. Output is added. Also,
The upper end of the rough material R is firmly attached to the fixed die 6 by the inverse gradient K. For this reason, as shown in FIG. 6, when the rough material R is extruded from the fixed die 6, the intermediate portion of the rough material R may be broken. The technical problem of the present invention is
When the mold is opened, the molten material solidified in the passage can be securely held in the fixed mold, and when the molten material is extruded from the fixed mold, it is concentrated in a part and a large pushing force is not applied. It is intended to prevent breakage of the molten material.

[0005]

The above-mentioned problems can be solved by a die casting machine having the following features. That is,
In the invention according to claim 1, the molten metal material solidified in the passage communicating with the cavity is opened in a state of being held in the fixed die, and the molten material is pressed by a plunger tip to fix the fixed die. In the die-casting machine extruding from the fixed mold, the holding mold for holding the molten metal material, and moving the holding mold to a position away from the molten metal material, further, the molten metal material is almost the same as the plunger tip. An extruding mechanism for extruding from the fixed mold in synchronization is provided. Therefore, the molten metal material solidified in the passage can be held by the holding die in the fixed die. Therefore, for example, even when the product and the molten material are cut by opening the mold, the cutting can be stably performed. Further, when the molten material is extruded from the fixed die, the extruding mechanism operates to move the holding die to a position where the holding die comes off the molten material, and the pressing force from the plunger tip and the extruding mechanism push against the molten material. Pressure will be applied. Therefore, a large pushing force is not applied to a part of the molten material, so that the molten material can be prevented from being broken. Therefore, the molten material can be surely extruded from the mold, and the reliability of the die casting machine is improved.

[0006]

DETAILED DESCRIPTION OF THE INVENTION A die casting machine according to an embodiment of the present invention will be described below with reference to FIGS.
Here, FIG. 1 to FIG. 3 are longitudinal cross-sectional views showing the operation of the die casting machine according to the present embodiment, and FIG. 4 is a longitudinal cross-sectional view of the main portion of the die casting machine according to the present embodiment. The die casting machine 10 has a main movable die 12 as shown in FIG.
The intermediate movable mold 14 and the fixed mold 16 are provided, and the fixed mold 16 is further equipped with a holding mold 20 that can be moved up and down. The main movable die 12 has a structure in which the intermediate movable die 14 is clamped laterally.
When the mold 4 is clamped, a cavity 13 which is a product molding portion is formed inside.

Further, the intermediate movable mold 14 has a structure which is clamped laterally with respect to the fixed mold 16 and the holding mold 20, and the intermediate movable mold 14, the fixed mold 16 and the holding mold 20 are clamped. In this state, a main runner 16m, a runner 14r and a gate 14j for supplying molten metal to the cavity 13 are formed inside. The holding mold 20 is held at the mold clamping position, that is, the lower limit position, so that the molten metal material (hereinafter, referred to as the rough material R) solidified at the position of the main runner 16m is held in the fixed mold 16. The main runner 16m is provided with a hook portion 22 that engages with the rough material R at a portion that constitutes an upper end portion thereof.

Further, the holding die 20 has a prismatic insertion portion 23 at a position horizontally displaced from the hook portion 22 by a predetermined dimension.
Is vertically provided, and the insertion portion 23 is housed in a recess 16y formed in the upper portion of the fixed mold 16 in a vertically movable state. Further, a piston rod 24p of an elevating cylinder 24 attached to the fixed die 16 is connected to the upper surface of the holding die 20, and by the action of the elevating cylinder 24, the holding die 20 is predetermined according to the recess 16y. It can be raised and lowered within the range. The holding mold 20
A vertical surface 25 is formed on the right side surface of the insertion portion 23, and an inclined surface 26 is continuously formed below the vertical surface 25. Then, the vertical surface 25 or the inclined surface 26
The spherical end 32 of the extruding pin 30, which will be described later, comes into contact.

The push-out pin 30 is a pin having a spherical end 32 and a flat end 34, and is formed in a horizontal hole 16h formed horizontally between the recess 16y of the fixed mold 16 and the main runner 16m. It is stored slidably. Further, a spring (not shown) is installed between the push-out pin 30 and the lateral hole 16h so as to push the push-out pin 30 toward the recess 16y. As a result, the spherical end 32 of the push pin 30 is recessed into the recess 16
The vertical surface 25 or the inclined surface 26 of the holding die 20 protruding in y
Always comes into contact with. Here, the extrusion pin 30
The length of the spherical end 32 is equal to the vertical surface 2 of the holding mold 20.
5 is set to a value such that the flat end 34 on the opposite side is continuous with the wall surface of the main runner 16m in the state of being in contact with 5.

With this structure, when the holding die 20 is raised, the spherical end portion 32 of the extruding pin 30 follows the vertical surface 25 to the inclined surface 26, and the extruding pin 30 resists the spring force. Then, it is displaced to the right in the figure. As a result, the flat end 34 of the extrusion pin 30 projects into the main runner 16m and the rough material R can be extruded. On the contrary, when the holding die 20 is lowered, the pushing pin 3
The spherical end 32 of 0 follows the inclined surface 26 to the vertical surface 25, and the push pin 30 thereof is displaced leftward in the figure by the spring force. As a result, the flat end 34 of the push pin 30 is returned to a position continuous with the wall surface of the main runner 16m. That is, the vertical surface 25 of the holding mold 20,
The inclined surface 26 functions as a cam.

A sprue bush 16b for guiding a plunger tip 18 (see FIGS. 1 to 3) is provided below the fixed mold 16, and the sprue bush 16b is provided.
The lower end of the main runner 16m is connected to. Here, the plunger tip 18 has a function of press-fitting the molten metal in a plunger sleeve (not shown) into the cavity 13 and extruding the rough material R solidified at the position of the main runner 16m. further,
When the plunger tip 18 pushes out the rough material R, the lifting cylinder 24 also operates in synchronization with the plunger tip 18. As a result, the holding die 20 rises to disengage the hook portion 22 of the holding die 20 from the rough material R, and as described above, the flat end portion 34 of the extruding pin 30 projects into the main runner 16m to rough the rough material. R will be extruded. That is, the insertion portion 23 of the holding die 20, the lifting cylinder 24, and the push pin 30 function as the push mechanism of the present invention.

Next, the die casting machine 1 according to the present embodiment
The operation of 0 will be described. First, the lifting cylinder 24 holds the holding die 20 at the lower limit position, and the holding die 20 is clamped to the fixed die 16. Thereby, the fixed mold 1
The spherical end 32 of the extruding pin 30 mounted on the 6 comes into contact with the vertical surface 25 of the holding die 20, and the planar end 34 of the extruding pin 30 is continuous with the wall surface of the main runner 16m. Become. In this state, the main movable mold 12, the intermediate movable mold 14, and the fixed mold 16 are clamped, and as shown in FIG. 4, a cavity 13 is formed inside the main movable mold 12 and the intermediate movable mold 14, and Inside the intermediate movable mold 14 and the fixed mold 16, a main runner 16m, a runner 14r, and a gate 14j, which are molten metal passages, are formed.

When the main movable die 12, the intermediate movable die 14 and the fixed die 16 are clamped in this manner, the plunger tip 18 operates and the molten metal in the plunger sleeve is sprue bush 16b and the main runner. 16 m, it passes through the runner 14 r and the gate 14 j, and is press-fitted into the cavity 13. Then, as shown in FIG. 1, when the molten metal is solidified after a lapse of a predetermined time, the fixed mold 16 is maintained while the main movable mold 12 and the intermediate movable mold 14 are clamped.
Then, the fixed mold 16 and the intermediate movable mold 14 are opened. At this time, the rough material R is held in a state of being attached to the fixed die 16 by the function of the hook portion 22 of the holding die 20. Therefore, a tensile force is applied between the rough material R held by the fixed die 16 and the product W held by the main movable die 12 and the intermediate movable die 14, and as shown in FIG. R is cut from the product W at the narrow gate 14j.

Next, the plunger tip 18 advances, and further, in synchronization with the advance of the plunger tip 18, the lifting cylinder 24 raises the holding die 20. As a result, the hook portion 22 of the holding die 20 is disengaged from the rough material R, and the inclined surface 26 of the holding die 20 displaces the extrusion pin 30 in the right direction in the drawing to press the rough material R. That is, since the biscuit portion Rb is pressed by the plunger tip 18 and the upper end portion is pressed by the pushing pin 30, the rough material R is efficiently pushed out from the fixed mold 16. The product W is composed of the main movable die 12 and the intermediate movable die 1
4 and 4 are pushed out by a push pin (not shown) in a state where the mold is opened.

As described above, according to the die casting machine 10 of the present embodiment, the rough material R can be held by the holding die 20 on the fixed die 16 when the die is opened. The cutting can be performed stably and surely. Further, when the rough material R is extruded from the fixed mold 16, the extrusion pin 30 operates almost in synchronization with the plunger tip 18, so that a large pushing force is not concentrated on a part of the rough material R and the rough material R is not applied. The breakage of R can be prevented. Therefore, the rough material R can be surely extruded from the fixed mold 16, and the reliability of the die casting machine 10 is improved.

Although the embodiment of the present invention has been described above, the embodiment of the present invention has various technical matters as described below in addition to the technical matters described in the claims. Please note that. (1) In the die-casting machine according to claim 1, when the biscuit formed by the plunger tip is the base end of the rough material, the extrusion mechanism is a position where the tip end of the rough material can be extruded. A die casting machine characterized by being placed in. The rough material can be efficiently extruded from the mold. (2) In the die-casting machine according to claim 1, the extrusion mechanism includes a cam formed in a holding die and an extrusion pin that is moved by the cam, and the extrusion pin moves when the holding die moves up and down. Is a die casting machine characterized by moving horizontally. Since the mechanism for driving the push pin is arranged at a right angle to the push pin, the space for the push mechanism can be reduced.

[0017]

According to the present invention, it is possible to prevent the molten material from being broken when it is extruded from the die, so that the molten material can be reliably pushed out of the die. Therefore, the reliability of the die casting machine is improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an essential part showing the operation of a die casting machine according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of an essential part showing the operation of the die casting machine according to the embodiment of the present invention.

FIG. 3 is a cross-sectional view of an essential part showing the operation of the die casting machine according to the embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of a main part of a die casting machine according to an embodiment of the present invention.

FIG. 5 is a cross-sectional view of an essential part showing the operation of a conventional die casting machine.

FIG. 6 is a cross-sectional view of an essential part showing the operation of a conventional die casting machine.

[Explanation of symbols]

 R Rough material (molten metal material) W product 12 Main movable type 14 Intermediate movable type 16 Fixed type 18 Plunger tip 20 Holding type 22 Hook part 23 Insertion part (extrusion mechanism) 24 Lifting cylinder (extrusion mechanism) 24 Vertical surface 25 Sloping surface 30 Extrusion pin (extrusion mechanism)

Claims (1)

[Claims] 1. A die cast in which a molten metal material solidified in a passage communicating with a cavity is held open in a fixed die, and the molten material is pushed out from the fixed die by pressing with a plunger tip. In the machine, the fixed mold, a holding mold for holding the molten material,
The die casting machine is provided with an extruding mechanism for moving the holding die to a position where it is separated from the molten material and extruding the molten material from the fixed die substantially in synchronization with the plunger tip. .